Last week Obama was in Boston and New York for several fundraising events, including one for Massachusetts Senate candidate Ed Markey (D) and two events for the Democratic National Committee in New York.
The first lady campaigned and raised money for President Obama last election cycle and her movement this year indicates races that are important to Democrats.
Markey is running for the special election for Secretary of State John Kerry's seat. He is leading GOP nominee Gabriel Gomez in the polls but by a tight margin. And former Republican Sen. Scott Brown first won his seat in a special, which tends to have lower voter turnout, giving the GOP better odds in deep-blue Massachusetts.
Meanwhile, McAuliffe, the former head of the party who has close ties to the Clintons, is in a tough race for Virginia's gubernatorial mansion. He leads Republican nominee Ken Cuccinelli by single digits, according to polls of the race. Virginia holds its gubernatorial election in November.